Connect Motion to your computer by following this procedure : How to connect to a computer via USB.

Copy and paste any OAO files you wish to convert to GPX in the "/logs" folder.

You can also do it the other way around (GPX to OAO) by placing the files in the "/tracks" folder.

To exit safely, the preferred method is to select the disk drive and choose your operating system variation of "Eject safely".
Or, press both upper-right and lower-center buttons on Motion.

Motion will notice the new files and will convert OAO to GPX and GPX to OAO. This might be long due to GPX format verboseness.

Once done, another popup will warn you of the conversion completion.

You can now connect Motion to your computer again to retrieve all the converted files in either "/logs" or "/tracks" folder.

All OAO logs previously placed in the "/logs" folder are now GPX files.